Malicious PDF — malware analysis report

Static analysis result for SHA-256 095d3e494fdf65bb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 20:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d30c2fdda7554e00ac99f0aed5bf1de SHA-1: eda536069d89a5887d5cb70cd28faea819d4db26 SHA-256: 095d3e494fdf65bb89a82e9881954a4312a10959e809aab456114e175082f10e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.jysunshine-hotel.com/up_files/file/90851567734.pdf In PDF document text
    • http://sumosushingrill.com/uploads/files/43313362069.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365f83b5091---wuwugawoxovorup.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138ada1c00ac---67209125463.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/dotadekejunolagogabuwa.pdfIn PDF document text
    • https://thietbigas.net/media/files/1864939467.pdfIn PDF document text
    • http://unseretochter.com/images/file/32648619948.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/560aeb424000b0586242c576166e0eff/1827485329.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/18980145231.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/32232091645.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7a31eebb1f35f2a1d7fc8bef656f1263/jigawutakiterit.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/nusav.pdfIn PDF document text
    • http://status.cz/UserFiles/File/96875151489.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/sowexiwesiratelajatu.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jufolomej.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebdf47c14---batorufuji.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/vubegeratulopunufufumexi.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210901161711.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353d035edaf---fakuwaj.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/60086948420.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1331518a---mekowesejisulajubebi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pidemabipusiwedariduruk.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/rivibifur.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/59531318259.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16304798191545.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/94615624956.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/84220246706.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fefosefutajolivugipejuwoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=router+installation+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73A 16928 bytes
SHA-256: c39371c9580b76c486d1992a48af27f6aecc9e100372bf0b12c758a26094ade9
font_01_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 10636 bytes
SHA-256: 2b6d9dd4a746e615938ff8a622a42c59e42347b031cf01a640ae128440d8fcb3
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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